One example of a JMS topic in a Flex client is user presence.

在Flex客户端使用JMS主题的一个例子是用户上线。

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Presence is a way for a user to express themself and populate the online space.

这种存在感是用户表达自己并加入在线空间的一种方式。

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Users and services can subscribe to the presence and capabilities of another user or group of users.

用户和服务可以订阅另一个用户或用户组的存在情况和功能。

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Companies spend massive dollars on display ad networks to generate awareness which then results in intent-laden search queries for products leading to search engine marketing ads. dCommerce is shifting product discovery away from display advertising to product presence in user feeds on social networks such as Pinterest.

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With presence, a user would know whether a contact was available for a quick voice call.

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Consumers are drawn to the mobile Internet because it can be highly contextual and leverages information such as geo-location, presence, and user-specific information to deliver a rich and intensely personal experience.

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